How to exit fullscreen by pressing phone's back key.

使用chewie插件，发现视频全屏播放状态下，按手机返回键不是退出全屏，而是返回上一个页面。如何设置，全屏播放状态下，按手机返回键退出全屏而不是返回上一个页面。

(google translate)
Use chewie plug-in and find that when the video is playing in full screen, pressing the mobile phone's return key does not exit the full screen, but returns to the previous page. How to set, in full-screen playback state, press the phone's back key to exit full screen instead of returning to the previous page.